tamaño: 2.5×2.5cm Power supply: 2.7~5V@30mA Work frequency: 125KHz Support chip: ATA5557, T5567, T5577 o chip compatible (predeterminada del código Manchester formato RF / 32) Interfaz: Puerto serial (formato TTL-232) distancia de lectura: <7cm, distancia de escritura: <6cm (T5557, T5567, T5577 Chip R/W Module has read-only and read-write two models, according to the project needs to choose the right module.)